But at the least, they help to paint a picture of how he lived.
And, for investors in the enterprises they help to run, they bring more specific risks.
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At low altitudes they help to cool the Earth by reflecting sunlight away from it.
They help to boost investment at home and allow the diversification of pension provision into overseas economies.
The second point is that they help to keep talented people in academia.
They help to make up for the domestic outflow (the big difference is that they are far less well-educated).
People will support what they help to create much more enthusiastically than when told what they should or must do.
One of the great benefits of the easier movement of workers is that they help to keep labour markets flexible.
By publicising the government's efforts to fight crime, they help to deter it, as well as strengthening public confidence in the police.
By giving hope for the future and providing structure and a sense of normalcy, they help to mitigate the effects of conflict, disaster and displacement.
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Talk of crowdfunding as a short-lived fad has largely ceased, as evidence mounts that lots of people value personal engagement with projects they help to finance.
The White House will see a silver lining in today's grim GDP figures, if they help to remind the negotiators on Capitol Hill of the fragility of the US recovery.
"The staff in the activity centre are absolutely fantastic and cannot do enough for the children they look after, play with and to whom they help to provide reassurance, " she said.
Public-sector unions wield undue influence, argues Steven Malanga of the Manhattan Institute, author of a book on the subject, since they help to elect the very people who set their wages.
What Zuckerberg, Buffett et al want is to give the government more money, but to do so with at least some modicum of certainty that the sum they help to raise will be large enough to have an impact.
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It's time for the profession -- and business -- of reproductive medicine to accept their firm, inescapable ethical obligation to give the interests and well-being of the children they help to create the same consideration they give to the desires of the adults they serve.
French President Jacques Chirac, the summit host, told reporters that the EU leaders were desperately concerned about the escalating violence and wanted to do anything they could to help to restore dialogue.
Although none of these schemes is likely to come to anything, they all help to distract attention from the central point: Russia agreed to take on the Soviet Union's liabilities in return for acquiring its assets.
They often fear that by doing so, they will help to elect the candidate that they like least out of the three or four on the ballot.
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They wanted to help develop it, they wanted to be able to say I had a part in creating this incredible new form that brings people across the world together, makes the world more of a global village as we call it.
After three months, 27 people - 60 % of the "no statins" group - had either died or were disabled to the point that they needed help to live a normal life, compared with 16 people from the group allowed to keep taking statins.
Electronic Arts (EA) will soon be increasing their workforce from 400 to 600 in Baton Rouge after they received help to create internal software that makes their game testing more efficient.
If they decide to ask for help they will have to approach the eurozone's bailout fund and ask it to buy their bonds at auction.
We want to strengthen Lebanese armed forces so that they can help to secure the sovereignty and territory of Lebanon.
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The aim of the Youth Summit is to explore what World Heritage means to young people in Scotland and how they can help to preserve and protect the internationally important cultural and natural heritage on their doorstep.
The aim of the 2010 World Heritage Youth Summit is to explore what World Heritage means to young people in Scotland and how they can help to preserve and protect the internationally important cultural and natural heritage on their doorstep.
"Our aid will help the poorest to get the help they need to stand on their own and make them better able to cope when crises occur, " international development minister Lynne Featherstone said in a statement.
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